package com.sky.service.impl;

import com.github.pagehelper.Constant;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 套餐分页查询
     * @return
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        log.info("套餐分页查询：{}", setmealPageQueryDTO);
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 新增套餐
     * @param setmealDTO
     */
    @Transactional
    public void save(SetmealDTO setmealDTO) {
        log.info("新增套餐:{}", setmealDTO);
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        //默认设置禁用
        setmeal.setStatus(0);
        //新增到套餐表
        setmealMapper.save(setmeal);
        //获取套餐中的菜品数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        //套餐中的菜品可能为空
        if(setmealDishes != null && !setmealDishes.isEmpty()){
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmeal.getId());
            });
            log.info("开始插入套餐菜品：{}",setmealDishes);
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 根据id查询相关套餐
     * @param id
     * @return
     */
    public SetmealVO getByIdWithSetmealDishes(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        List<SetmealDish> setmealDishes = setmealDishMapper.getById(id);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     * @return
     */
    public void updateWithSetmealDishes(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        setmealMapper.update(setmeal);
        //删除这个套餐得菜品
        log.info("删除相应套餐的菜品：{}",setmeal);
        setmealDishMapper.deleteBySetmealId(setmealDTO.getId());
        //重新插入套餐相关的菜品
        List<SetmealDish> setmealDishes =setmealDTO.getSetmealDishes();
        if(setmealDishes != null && !setmealDishes.isEmpty()){
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealDTO.getId());
            });
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    public void deleteBatch(List<Long> ids) {
        //判断当前套餐是否能够删除--是否存在起售中的套餐
        for (Long id : ids) {
            Setmeal setmeal = setmealMapper.getById(id);
            if(Objects.equals(setmeal.getStatus(), StatusConstant.ENABLE)){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //删除套餐表中的套餐数据以及关联的菜品数据
        setmealMapper.deleteBatch(ids);
        setmealDishMapper.deleteBySetmealIds(ids);
    }

    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }


        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }

}
